The interpreter engine for the core JavaScript language, independent of the browser's object model. File ONLY core JavaScript language bugs in this category. For bugs involving browser objects such as "window" and "document", use the "DOM" component. For bugs involving calls between JavaScript and C++, use the "XPConnect" component.

Created attachment 532611[details][diff][review]
Patch
In jsop_relational_double, syncExit for the lhs has to be called before loading the rhs. I thought about adding a helper function but this pattern is not that common so I went with the straight-forward fix; suggestions welcome.